How does Levitra (Vardenafil) work?
Levitra (Vardenafil) inhibits an enzyme called phosphodiesterase type 5 (PDE-5) which means muscle in the penis is more likely to relax and allow blood to flow in, causing an erection. For Levitra (Vardenafil) to be effective, sexual stimulation is required and so Levitra (Vardenafil) will not create an erection unless a man engages in sexually exciting activity.